Qt框架中Q_PROPERTY宏的使用

Q_PROPERTY(type name READ getFunction [WRITE setFunction] [NOTIFY signal] [OTHER options])

Q_PROPERTY(QImage displayImage READ displayImage NOTIFY imageChanged)

Q_PROPERTY(QColor currentColor READ currentColor WRITE setCurrentColor NOTIFY currentColorChanged)

Q_PROPERTY(int currentFontSize READ currentFontSize WRITE setCurrentFontSize NOTIFY currentFontSizeChanged)

Q_PROPERTY(QString currentTool READ currentTool WRITE setCurrentTool NOTIFY currentToolChanged)

// 读取颜色
var color = imageProcessor.currentColor

// 读取字体大小
var size = imageProcessor.currentFontSize

// 读取工具类型
var tool = imageProcessor.currentTool

// 修改颜色
imageProcessor.currentColor = "blue"

// 修改字体大小
imageProcessor.currentFontSize = 30

// 修改工具
imageProcessor.currentTool = "circle"

Rectangle {
    color: imageProcessor.currentColor  // 自动绑定，颜色变化时自动更新
}

Label {
    text: "字体大小: " + imageProcessor.currentFontSize  // 自动更新
}

Button {
    text: imageProcessor.currentTool === "rectangle" ? "矩形工具" : "其他工具"
}

ImageProcessor {
    onCurrentColorChanged: {
        console.log("颜色已改变为:", currentColor)
    }
    
    onCurrentToolChanged: {
        console.log("工具已切换为:", currentTool)
    }
    
    onImageChanged: {
        console.log("图像已更新")
    }
}

// 头文件中的声明
class ImageProcessor : public QObject
{
    Q_OBJECT
    Q_PROPERTY(QImage displayImage READ displayImage NOTIFY imageChanged)
    Q_PROPERTY(QColor currentColor READ currentColor WRITE setCurrentColor NOTIFY currentColorChanged)
    Q_PROPERTY(int currentFontSize READ currentFontSize WRITE setCurrentFontSize NOTIFY currentFontSizeChanged)
    Q_PROPERTY(QString currentTool READ currentTool WRITE setCurrentTool NOTIFY currentToolChanged)

public:
    // READ 函数
    QImage displayImage() const { return m_displayImage; }
    QColor currentColor() const { return m_currentColor; }
    int currentFontSize() const { return m_currentFontSize; }
    QString currentTool() const { return m_currentTool; }

    // WRITE 函数
    void setCurrentColor(const QColor &color) {
        if (m_currentColor != color) {
            m_currentColor = color;
            emit currentColorChanged();
        }
    }
    
    void setCurrentFontSize(int size) {
        if (m_currentFontSize != size) {
            m_currentFontSize = size;
            emit currentFontSizeChanged();
        }
    }
    
    void setCurrentTool(const QString &tool) {
        if (m_currentTool != tool) {
            m_currentTool = tool;
            emit currentToolChanged();
        }
    }

signals:
    // NOTIFY 信号
    void imageChanged();
    void currentColorChanged();
    void currentFontSizeChanged();
    void currentToolChanged();

private:
    QImage m_displayImage;
    QColor m_currentColor;
    int m_currentFontSize;
    QString m_currentTool;
};